Progressive failure analysis of unidirectional fiber-reinforced polymers with inhomogeneous interphase and randomly distributed fibers under transverse tensile loading
Progressive failure analysis of unidirectional fiber-reinforced polymers with inhomogeneous interphase and randomly distributed fibers under transverse tensile loading
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DOI：
10.1016/j.compositesa.2010.09.001
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发表时间：
2010-12
影响因子：
8.7
通讯作者：
M. Romanowicz
中科院分区：
文献类型：
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作者：
M. Romanowicz
使用基于有限元方法的数值均化技术研究了界面脱粘损伤对横向拉伸下单向纤维增强聚合物初始失效后行为的影响。对包含在横截面上随机分布且具有不均匀界面层的纤维的晶胞进行计算。在全球和地方层面对渐进性失败的机制进行了研究。对所提出的微观力学模型的详细分析表明，它能够正确模拟损伤的演变并解释软化机制。研究发现，单向薄板在横向拉力作用下的初始破坏行为主要受界面强度和相间刚度控制。本研究表明，局部纤维阵列不规则性是通过局部应力集中和局部化发生而导致基体开裂的重要原因。
The effect of damage due to interfacial debonding on the post initial failure behavior of unidirectional fiber-reinforced polymers subjected to transverse tension was investigated using numerical homogenization techniques based on the finite element method. Calculations were performed for unit cells containing fibers distributed at random over the transverse cross-section with inhomogeneous interphase layers. The mechanism of progressive failure was examined at both a global and a local level. A detailed analysis of the proposed micromechanics model revealed that it is able correctly to simulate the evolution of damage and to explain the softening mechanism. It was found that the post initial failure behavior of unidirectional lamina under transverse tension is mainly controlled by the interface strength and the interphase stiffness. The present study showed that local fiber array irregularities are a significant contributor to matrix cracking through local stress concentrations and the occurrence of localization.